Spin-Wave Theory and Finite-Size Scaling for the Heisenberg Antiferromagnet

Abstract

Spin-wave perturbation theory for the Heisenberg antiferromagnet at zero temperature is used to compute the finite-lattice corrections to the ground state energy, the staggered magnetization and the energy gap. The dispersion relation, the spin-wave velocity and the bulk ground state energy to order $O(1/S^2)$ are also computed for the square lattice. The results agree very well with the predictions of Neuberger and Ziman and Fisher.

arXiv comment19 pages(3 figures not included), RevTeX 2.0, Submitted to Phys. Rev B (BV4570)

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